Formula: Fe1-xS (x = 0 to 0.17)
Reflected/transmitted colour: opaque, polished section cream with a faint pinkish brown tint, tarnishes slowly in air
Pleochroism: weak
Optical isotropy/anisotropy: polished section very strong anisotropic, yellow-gray, greenish gray or grayish blue, intensity of anisotropy depends on orientation.
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section very distinct, ε brownish creamy, w reddish brown
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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